Buick Regal: Auxiliary Audio Input Malfunction (IOB)
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Refer to Diagnostic Procedure Instructions provide an overview of each
diagnostic category.
Diagnostic Fault Information
1. USB port Inoperative
2. No left side audio from device connected to AUX jack
3. No right side audio from device connected to AUX jack
4. Noticeable distortion may be present in affected audio channel
5. Fault may affect one or more components, dependent on fault location
6. Fault affects multiple components, dependent on vehicle equipment
7. Radio does not detect auxiliary device connection, AUX not available as input
selection
8. AUX always available as an input selection, with or without auxiliary device
connected
Circuit/System Description
Auxiliary Audio Input Jack
The 3.5 mm (1/8 in.) auxiliary audio input jack is located in the console.
All circuits from the auxiliary
jack are connected directly to the radio. When a device is connected to the
auxiliary jack an internal
switch opens. The radio detects the device and switches to AUX as the audio
source. Audio signals from
the device are sent to the radio from the auxiliary input jack via the left,
right, and common audio signal
circuits.
USB Port
The vehicle may be equipped with a USB port in the console. This port allows
USB connectivity to the
infotainment system from portable media players or a USB storage device (memory
stick/flash drive).
When a device is connected to the USB port, the system detects the device and
switches to USB as the
audio source. Once connected, the device can be controlled from the radio
controls.
The USB port is connected to the radio via a standard USB cable. Mini type USB
connectors are used to
connect the cable at the USB port and at the radio or multimedia player
interface module. Standard USB
male to female connections are typically used for connecting USB cables together
where an in-line connection is required. An in-line cable connection is
typically found between the console and I/P
harness.
Not all portable media player devices are compatible. Refer to the vehicle
owner's manual for
information on USB devices, control, and operation.
Diagnostic Aids
Auxiliary Audio Input Jack
- When a device is first connected to the 3.5 mm (1/8 in.) input jack the
infotainment system
automatically switches to that device. If an auxiliary device has already
been connected, press the
AUX or CD/AUX button to select the device.
- If the system detects the device, but the audio is not heard or is not
clear, attempt to connect the
device using a different cable; cables can deteriorate over time or become
damaged.
- Playback of an audio device that is connected to the 3.5 mm jack can
only be controlled using the
controls on the device.
- The volume control on the device may need to be adjusted to ensure
sufficient playback volume
through the infotainment system.
USB
- When a device is first connected to the USB port, the infotainment
system automatically switches
to that device. If an auxiliary device has already been connected, press the
AUX or CD/AUX
button to select the device.
- A low battery condition in a portable media player may not allow the
device to connect to the
system, or can create communication issues with the device. Verify the
device battery state of
charge and re-charge or replace as needed.
- Connect the device directly to the USB port if possible. Only use a
cable if it is required to
connect the device. The use of extension cables can cause communication
issues.
- If a cable is required for connection, attempt to connect the device
using a different cable; cables
can deteriorate over time or become damaged.
- Attempt audio playback from multiple USB devices when diagnosing USB
concerns. Device
compatibility can vary based on vehicle equipment. If the infotainment
system is capable of
operating any USB type device, the cause of the concern is not with the
vehicle system. The
inoperative device (s) may be incompatible or contain no recognized media
types.
- If a 'Device Not Supported' or similar type error message is displayed,
this indicates the system
has connected to the device but cannot communicate with it properly. This
does not indicate an
issue with the vehicle system. The device may be incompatible, may require a
'reset', or may
require an update to its software/firmware.
- If a 'No Supported Data Found' or similar type error message is
displayed, this indicates the
system has connected to the device and is communicating, but cannot find any
compatible
files/data. This does not indicate an issue with the vehicle system. Verify
the device contains
compatible media/file types.
- Poor connections or damaged USB cables can cause intermittent or no
operation of USB devices.
Inspect connectors, terminals, and cables for damage and replace components
as necessary.
Ensure all USB inline connections and connections at components are fully
seated and connector
position retainers/locks are secure.
Reference Information
Schematic Reference
Radio/Navigation System Wiring Schematics (IOB) , Radio/Navigation System
Wiring Schematics
(IOR) or Radio/Navigation System Wiring Schematics (IO5/IO6) , or
Radio/Navigation System
Wiring Schematics (IOS/IOT).
Connector End View Reference
Component Connector End View Index
Description and Operation
Radio/Audio System Description and Operation (IO6) , Radio/Audio System
Description and Operation (IOB) , or Radio/Audio System Description and
Operation (IOS/IOT/IOU).
Electrical Information Reference
- Refer to Circuit Testing
- Refer to Connector Repairs
- Refer to Testing for Intermittent Conditions and Poor Connections
- Refer to Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information.
Special Tools
- EL-50334-20 Multi-Media Interface Tester (MIT)
- EL-50334-50 USB Cable and Adapter Kit
For equivalent regional tools, refer to Special Tools and Equipment
Circuit/System Verification
Auxiliary Audio Input Jack
1. Verify no DTCs are present.
Refer to Diagnostic Trouble Code (DTC) List - Vehicle.
- Go to next step: If no DTCs are present
2. Ignition ON/vehicle in Service Mode, radio ON.
3. Verify the infotainment system switches to AUX as the audio source with the
EL-50334-20 Multi-
Media Interface Tester (MIT) connected to the auxiliary audio input jack.
- If the infotainment system does not switch to AUX as the audio source
Refer to Circuit/System Testing - Auxiliary Input Jack.
- Go to next step: If the infotainment system switches to AUX as the
audio source
4. Verify the audio from the EL-50334-20 Multi-Media Interface Tester (MIT)
is heard through the
vehicle infotainment system while operating the test tool to begin audio
playback.
- If audio is not heard from the test tool.
Refer to Circuit/System Testing - Auxiliary Input Jack.
- Go to next step: If audio is heard from the test tool.
5. All OK
USB Port
1. Verify no DTCs are present.
Refer to Diagnostic Trouble Code (DTC) List - Vehicle.
- Go to next step: If no DTCs are present
2. Ignition ON/vehicle in Service Mode, radio ON.
3. Verify the infotainment system switches to USB as the audio source with
the EL-50334-20 Multi-
Media Interface Tester (MIT) connected to the USB port.
- If the infotainment system does not switch to USB as the audio source
Refer to Circuit/System Testing - USB Port.
- Go to next step: If the infotainment system switches to USB as the
audio source
4. Verify the audio from the EL-50334-20 Multi-Media Interface Tester (MIT)
is heard through the
vehicle infotainment system while operating the system to play audio from the
test tool.
- If audio is not heard from the test tool.
Refer to Circuit/System Testing - USB Port.
- Go to next step: If audio is heard from the device
5. All OK.
Circuit/System Testing
Auxiliary Audio Input Jack
1. Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the X83
Auxiliary Audio Input.
Ignition ON/vehicle in Service Mode, radio ON.
2. Test for 2.5 - 3.5 V between the signal circuit terminal 5 and ground.
- Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the A11
Radio.
- Test for infinite resistance between the signal circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- Go to next step: If infinite resistance
- Test for less than 2 Ω in the signal circuit end to end
- If 2 Ω or greater, repair the open/high resistance in the circuit.
- If less than 2 Ω, replace the A11 Radio.
- Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the A11
Radio, ignition
ON/vehicle in Service Mode.
- Test for less than 1 V between the detection circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the A11 Radio.
- Go to next step: If between 2.5 - 3.5 V
3. Test for less than 1 V between the signal circuits listed below and
ground:
- Left auxiliary audio signal circuit terminal 1
- Right auxiliary audio signal circuit terminal 2
- Auxiliary audio common signal circuit terminal 3
- If 1 V or greater
- Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the A11
Radio. Ignition
ON/vehicle in Service Mode.
- Test for less than 1 V between the signal circuit and ground.
- If 1 V or greater, repair the short to voltage on the circuit.
- If less than 1 V, replace the A11 Radio.
- Go to next step: If less than 1 V
4. Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the A11
Radio.
5. Test for infinite resistance between the signal circuits listed below and
ground:
- Auxiliary audio common signal circuit terminal 18
- Left auxiliary audio signal circuit terminal 19
- Right auxiliary audio signal circuit terminal 20
- If less than infinite resistance
Repair the short to ground on the circuit.
- Go to next step: If infinite resistance
6. Test for less than 5 Ω between the signal circuit terminals listed below:
- A11 Radio terminal 19 X1 and the X83 Auxiliary Audio Input terminal 1 X1
- A11 Radio terminal 20 X1 and the X83 Auxiliary Audio Input terminal 2 X1
- A11 Radio terminal 18 X1 and the X83 Auxiliary Audio Input terminal 3 X1
- If 5 Ω greater
Repair the open/high resistance in the circuit.
- Go to next step: If less than 5 Ω
7. Replace the X83 Auxiliary Audio Input. Connect all harness connectors.
8. Connect and operate the EL-50334-20 Multi-Media Interface Tester (MIT).
9. Verify the audio from the test tool is heard through the vehicle infotainment
system.
- If audio is not heard from the test tool
Replace the A11 Radio.
- Go to next step: If audio is heard from the test tool
10. All OK.
USB Port
1. Ignition OFF/vehicle OFF, disconnect the USB cable connection at the A11
Radio.
NOTE: USB cables and adapters for the following tests are found in the
EL-
50334-50 USB Cable and Adapter Kit.
2. Connect the EL-50334-1 Type A male to Mini A male USB Cable to the A11
Radio. Connect the
EL-50334-3 Type A female to Type A female adapter to the EL-50334-1 Cable.
3. Ignition ON/vehicle in Service Mode, radio ON, connect the EL-50334-20
Multi-Media Interface
Tester (MIT) to the EL-50334-3 adapter.
4. Verify the infotainment system switches to USB as the audio source.
- If the infotainment system does not switch to USB as the audio source
Replace the A11 Radio.
- Go to next step: If the infotainment system switches to USB as the
audio source
5. Ignition OFF/vehicle OFF, connect the vehicle USB cable to the A11 Radio.
Disconnect the I/P to
floor console inline USB cable connector.
NOTE: The EL-50334-3 or EL-50334-4 adapter may be required for the
following test.
6. Ignition ON/vehicle in Service Mode, radio ON, connect the EL-50334-20
Multi-Media Interface
Tester (MIT) to the I/P side of the inline USB cable connector.
7. Verify the infotainment system switches to USB as the audio source.
- If the infotainment system does not switch to USB as the audio source
Replace the I/P USB cable assembly.
- Go to next step: If the infotainment system switches to USB as the
audio source
8. Ignition OFF/vehicle OFF, connect the I/P to floor console inline USB
cable connector.
9. Disconnect the USB cable at the X83 Auxiliary Audio Input. Connect the
EL-50334-4 Type A
female to Mini B female adapter to the USB cable.
10. Ignition ON/vehicle in Service Mode, radio ON, connect the EL-50334-20
Multi-Media Interface
Tester (MIT) to the EL-50334-4 adapter.
11. Verify the infotainment system switches to USB as the audio source.
- If the infotainment system does not switch to USB as the audio source
Replace the console USB cable assembly.
- Go to next step: If the infotainment system switches to USB as the
audio source
12. Test or replace the X83 Auxiliary Audio Input.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Refer to Audio Disc Player and USB Receptacle Replacement
- Refer to Control Module References for radio replacement, programming,
and setup.
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Refe
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Refe
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Refe
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